EP0568984B1 - Procédé de fabrication de briquettes d'une composition prédéterminée - Google Patents

Procédé de fabrication de briquettes d'une composition prédéterminée Download PDF

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Publication number
EP0568984B1
EP0568984B1 EP93107235A EP93107235A EP0568984B1 EP 0568984 B1 EP0568984 B1 EP 0568984B1 EP 93107235 A EP93107235 A EP 93107235A EP 93107235 A EP93107235 A EP 93107235A EP 0568984 B1 EP0568984 B1 EP 0568984B1
Authority
EP
European Patent Office
Prior art keywords
briquettes
granular
green
rotary kiln
zone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93107235A
Other languages
German (de)
English (en)
Other versions
EP0568984A1 (fr
Inventor
Gert-Wilhelm Dr. Lask
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Applied Industrial Materials Corp
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Applied Industrial Materials Corp
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Filing date
Publication date
Application filed by Applied Industrial Materials Corp filed Critical Applied Industrial Materials Corp
Publication of EP0568984A1 publication Critical patent/EP0568984A1/fr
Application granted granted Critical
Publication of EP0568984B1 publication Critical patent/EP0568984B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B49/00—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
    • C10B49/16—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with moving solid heat-carriers in divided form
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/26—After-treatment of the shaped fuels, e.g. briquettes
    • C10L5/28—Heating the shaped fuels, e.g. briquettes; Coking the binders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined

Definitions

  • the invention relates to a process for the production of product briquettes of a given briquette composition with a product fraction, a carbon fraction from coke and optionally an additional fraction, which briquettes with the aid of a bituminous binder to form green briquettes and in a rotary kiln with a granular bed filling made of granular heat carriers burn the gas burner and withdraw it from the flue gas, heat treat it.
  • - Product briquettes are briquettes which are intended for a given use, for example as sand briquettes in the production of silicon or ferrosilicon, as ore briquettes in the production of the corresponding metals or as fuel briquettes.
  • the grain bed filling takes up about half the volume of the rotary kiln, for example a length of 50 meters and a diameter of 4 meters.
  • the buoyancy must be prevented so that the green briquettes do not float in the grain bed filling.
  • the weight of the green briquettes or the finished product briquettes that form must be greater than the weight of the displaced grain bed volume.
  • the specific weight of the green briquettes must be greater than the bulk density of the granular heat transfer medium of the grain bed filling.
  • the green briquettes are set up accordingly as part of the known measures. Their specific weight is set by the composition and the compression.
  • the grain bed filling consists of quartz sand or also of fine sand coke, in particular petroleum coke (cf. DE 37 24 541 A1, DE 37 24 464 A1). This has proven itself, but reduces the degree of process engineering freedom of the known measures. Furthermore, abrasion of the green briquettes cannot generally be prevented. This makes it necessary to replace the sand of the grain bed filling or the sand-fine coke of the grain bed filling from time to time.
  • a known method (DE 37 27 464 A1), special measures for setting up or maintaining different treatment zones for the green briquettes are not implemented in the rotary kiln.
  • the known method is characterized in that it works with green briquettes free of molten, baking coal, the specific weight of which is greater than the bulk density of by adjusting the mixing ratio and the compression fine sand coke, if the bottom of the rotary kiln is filled with fine sand coke.
  • the specific weight of the green briquettes is greater than the bulk density of quartz sand by setting the mixing ratio and the compression if the grain bed filling is made up of quartz sand.
  • the invention has for its object to simplify the method described above so that a renewal of the grain bed filling is no longer necessary in the manufacture of certain product briquettes.
  • the method should also be set up so that special operating parameters can be set above the grain bed filling in the rotary kiln.
  • green briquettes are introduced into the rotary kiln, the bituminous binder of which consists of a pitch / coal alloy and which is at a briquetting temperature of 100 ° C. to 200 ° C have been formed, the sand-fine coke grains in the green briquettes being melted into the pitch / coal alloy in the plasticizing zone.
  • the rotary kiln is preferably operated in such a way that the temperature in the grain bed filling rises to 550 ° C.
  • the rotary kiln is further operated in such a way that the temperature in the grain bed filling drops to approximately 450 ° C. in the tempering zone. It is advisable to design and operate the rotary kiln in such a way that the raw briquettes are annealed in the tempering zone for twenty to forty minutes, preferably about thirty minutes. - It goes without saying that the rotary kiln is regularly lined with refractory ceramic.
  • a grain bed filling the coke grains of which are sufficiently free of volatile constituents, can also be produced by the process according to the invention by starting the furnace journey with a sand bed, until the sand bed filling gradually converts the abrasion into a coke bed filling according to the invention. It goes without saying that part of the coke in the grain bed filling also burns. In this respect, refilling may be necessary.
  • the basic structure includes a device for shaping the green briquettes. This facility was not drawn.
  • the device for producing the product briquettes is a rotary kiln 1.
  • a grain bed filling 4 is located in the rotary kiln 1.
  • the granular heat transfer media are guided in a circuit from the feed side 2 through the rotary kiln 1 to the discharge side 3 and back again to the feed side 2.
  • the grain bed filling has the same composition as the green briquettes in terms of the granular product fraction and in relation to the granular carbon fraction.
  • the rotary kiln 1 can be heated from the feed side with at least one gas burner 5.
  • different hatching indicated that a plasticizing zone 6 with an oxidizing atmosphere is maintained in the rotary kiln 1 on the feed side, in which the temperature of the grain bed filling up to increases to over 500 ° C, but in the rest of an annealing zone 7 is realized in which a reducing atmosphere is maintained, in which the temperature of the grain bed filling drops again, to the extent of about 400 ° C.
  • the plasticizing zone 6 merges into the tempering zone 7 in the region of the longitudinal center of the rotary kiln.
  • the bituminous binder is plasticized in the green briquettes, the volatile components are expelled from the green briquettes sufficiently, the volatile components burning in the oxidizing atmosphere.
  • the green briquettes are thereby converted into raw briquettes. These reach tempering zone 7 and are tempered in the tempering zone to produce finished product briquettes.
  • the oxidizing atmosphere in the plasticizing zone 6 of the rotary kiln 1 is set with excess air via the operating parameters of the gas burner 5. As already mentioned, the volatile constituents emerging there from the green briquettes are burned via the grain bed filling 4 in the plasticizing zone 6. This creates the reducing atmosphere for the tempering zone 7.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (12)

  1. Procédé pour la production de briquettes de produit ayant une composition de briquette prédéfinie avec
    une part de produit,
    une part de carbone en coke et
    le cas échéant une part d'adjuvants,
    qui sont briquetées en briquettes vertes à l'aide d'un liant bitumineux et soumises à un traitement thermique dans un four rotatif contenant un lit granuleux composé de caloporteurs granuleux, four où pénètrent les flammes de brûleurs à gaz et dont est extrait le gaz de fumée, le procédé étant composé des étapes suivantes:
    a) des briquettes vertes sont formées à l'aide du liant bitumineux par compactage de la part granuleuse de produit et de la part granuleuse de carbone et le cas échéant de la part d'adjuvants à grains fins,
    b) le four rotatif est chargé d'un granuleux dont dont la composition correspond à la composition des briquettes vertes en ce qui concerne la part granuleuse de produit et en ce qui concerne la part granuleuse de carbone,
    c) lors du traitement thermique, le lit granuleux s'enrichit du résidu d'abrasion des briquettes, les caloporteurs granuleux du lit granuleux contenant le résidu d'abrasion des briquettes suivant un circuit entre le côté chargement et le côté déchargement du four rotatif et un surplus dû à l'absorption du résidu d'abrasion étant retiré.
  2. Procédé selon la spécification 1, le surplus dû à l'absorption du résidu d'abrasion étant inséré dans la production des briquettes vertes et intégré à celles-ci.
  3. Procédé selon une des spécifications 1 ou 2, utilisant du coke de pétrole comme part granuleuse de carbone.
  4. Procédé selon une des spécifications 1 à 3, utilisant du sable quartzeux comme part de produit intégrée aux briquettes vertes pour la fabrication de briquettes de sable (pour la production de silicium ou de ferrosilicium).
  5. Procédé selon une des spécifications 1 à 3, utilisant des minerais granuleux comme part de produit intégrée aux briquettes vertes pour la fabrication de briquettes de minerai (pour la production des métaux correspondants).
  6. Procédé selon une des spécifications 1 à 3, utilisant du charbon non agglutinant à grains fins comme part de produit intégrée aux briquettes vertes pour la fabrication de briquettes de combustible (pour la production de chaleur pour chauffage).
  7. Procédé pour la production de briquettes de produit ayant une composition de briquette prédéfinie avec
    une part de produit,
    une part de carbone en coke et
    le cas échéant une part d'adjuvants,
    qui sont briquetées en briquettes vertes à l'aide d'un liant bitumineux et soumises à un traitement thermique dans un four rotatif contenant d'un lit granuleux composé de caloporteurs granuleux;, four où pénètrent les flammes de brûleurs à gaz et dont est extrait le gaz de fumée, le procédé étant composé des étapes suivantes:
    a) des briquettes vertes sont formées à l'aide du liant bitumineux par compactage de la part granuleuse de produit et de la part granuleuse de carbone et le cas échéant de la part d'adjuvants à grains fins,
    b) le four rotatif est chargé d'un lit granuleux dont la composition correspond à la composition des briquettes vertes en ce qui concerne la part granuleuse de produit et en ce qui concerne la part granuleuse de carbone,
    c) lors du traitement thermique, le lit granuleux s'enrichit du résidu d'abrasion des briquettes,
    d) dans le four rotatif, il est maintenu du côté chargement une zone de plastification à atmosphère oxydante dans laquelle la température du lit granuleux monte au-dessus de 500 °C,
    e) dans le four rotatif, il est maintenu du côté déchargement une zone de recuit à atmosphère réductrice dans laquelle la température du lit granuleux redescend à environ 400 °C,
    f) la zone de plastification se transforme en zone de recuit au niveau du milieu du four rotatif,
    g) dans la zone de plastification, le liant bitumineux contenu dans les briquettes vertes est d'abord plastifié, les composants volatiles sont suffisamment expulsés des briquettes vertes et les briquettes vertes sont ainsi transformées en briquettes brutes,
    h) dans la zone de recuit, les briquettes brutes sont recuites en briquettes de produit finies,
    l'atmosphère oxydante de la zone de plastification du four rotatif étant réglée par l'intermédiaire des paramètres de service des brûleurs à gaz (excès d'air), les composants volatiles s'échappant des briquettes vertes étant brûlés dans la zone de plastification au-dessus du lit granuleux et ceci générant l'atmosphère réductrice pour la zone de recuit et les caloporteurs granuleux du lit granuleux contenant le résidu d'abrasion des briquettes suivant un circuit entre le côté chargement et le côté déchargement du four rotatif et un surplus dû à l'absorption du résidu d'abrasion des briquettes étant retiré.
  8. Procédé selon la spécification 1, le surplus dû à l'absorption du résidu d'abrasion étant inséré dans la production des briquettes vertes et intégré à celles-ci.
  9. Procédé selon une des spécifications 1 à 8, les briquettes vertes formées à l'aide d'une presse à briqueter étant introduites dans le four rotatif.
  10. Procédé selon une des spécifications 1 à 9, étant introduites dans le four rotatif des briquettes vertes dont le liant bitumineux est constitué d'un alliage poix/charbon et qui ont été formées à une température de briquetage de 100 °C à 200 °C, les grains de coke fins comme du sable étant fondus dans l'alliage poix/charbons des briquettes vertes dans la zone de plastification.
  11. Procédé selon une des spécifications 7 à 10, le four rotatif étant exploité de sorte que dans la zone de plastification, la température au sein du lit granuleux monte jusqu'à 550 °C et que dans la zone de recuit, la température au sein du lit granuleux baisse jusqu'à environ 450 °C.
  12. Procédé selon une des spécifications 7 à 11, le four rotatif étant exploité de sorte que les briquettes brutes soient recuites de vingt à quarante minutes dans la zone de recuit, de préférence trente minutes environ.
EP93107235A 1992-05-06 1993-05-04 Procédé de fabrication de briquettes d'une composition prédéterminée Expired - Lifetime EP0568984B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4214434 1992-05-06
DE4214434A DE4214434C1 (fr) 1992-05-06 1992-05-06

Publications (2)

Publication Number Publication Date
EP0568984A1 EP0568984A1 (fr) 1993-11-10
EP0568984B1 true EP0568984B1 (fr) 1996-11-06

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EP93107235A Expired - Lifetime EP0568984B1 (fr) 1992-05-06 1993-05-04 Procédé de fabrication de briquettes d'une composition prédéterminée

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EP (1) EP0568984B1 (fr)
DE (2) DE4214434C1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3724541A1 (de) * 1987-07-24 1989-02-02 Applied Ind Materials Verfahren und anlage zur herstellung von rohstoff-briketts fuer die erzeugung von silicium oder von siliciumcarbid oder von ferrosilicium
DE3727464A1 (de) * 1987-08-18 1989-03-02 Applied Ind Materials Verfahren und anlage zur herstellung von brennstoff-briketts
DE3843449A1 (de) * 1988-12-23 1990-06-28 Applied Ind Materials Brennstoff-briketts und verfahren zur herstellung
DE3930182A1 (de) * 1989-07-15 1991-01-24 Applied Ind Materials Verfahren fuer die herstellung von brennstoff-briketts

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Publication number Publication date
EP0568984A1 (fr) 1993-11-10
DE59304385D1 (de) 1996-12-12
DE4214434C1 (fr) 1993-07-15

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